Scale a BufferedImage the fastest and easiest way

Question

The task: I have some images, I scale them down, and join them to one image. But I have a little problem with the implementation:

The concr

Answer 1

public static double[] reduceQuality(int quality, int width, int height) {
    if(quality >= 1 && quality <= 100) {
        double[] dims = new double[2];
        dims[0] = width * (quality/100.0);
        dims[1] = height * (quality/100.0);
        return dims;
    } else if(quality > 100) {
        return new double[] { width, height };
    } else {
        return new double[] { 1, 1 };
    }
}

public static byte[] resizeImage(byte[] data, int width, int height) throws Exception {
    BufferedImage bi = ImageIO.read(new ByteArrayInputStream(data));
    BufferedImage bo = resizeImage(bi, width, height);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    ImageIO.write(bo, "jpg", bos);
    bos.close();
    return bos.toByteArray();
}

private static BufferedImage resizeImage(BufferedImage buf, int width, int height) {
    final BufferedImage bufImage = new BufferedImage(width, height, 
            (buf.getTransparency() == Transparency.OPAQUE ? BufferedImage.TYPE_INT_RGB
            : BufferedImage.TYPE_INT_ARGB));
    final Graphics2D g2 = bufImage.createGraphics();
    g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
    g2.drawImage(buf, 0, 0, width, height, null);
    g2.dispose();
    return bufImage;
}

This is taken straight from imgscalr at https://github.com/rkalla/imgscalr/blob/master/src/main/java/org/imgscalr/Scalr.java

My average time reducing the quality of an image of 8mb with dimensions of 5152x3864 was ~800ms.

No dependencies. I hate them. Sometimes.

THIS WILL ONLY WORK WITH jpg IMAGES. As far as I'm concerned.

Example:

byte[] of = Files.readAllBytes(Paths.get("/home/user/Pictures/8mbsample.jpg"));
    double[] wh = ImageUtil.reduceQuality(2, 6600, 4950);

    long start = System.currentTimeMillis();
    byte[] sof = ImageUtil.resizeImage(of, (int)wh[0], (int)wh[1]);
    long end = System.currentTimeMillis();

    if(!Files.exists(Paths.get("/home/user/Pictures/8mbsample_scaled.jpg"))) {
        Files.createFile(Paths.get("/home/user/Pictures/8mbsample_scaled.jpg"), Util.getFullPermissions());
    }

    FileOutputStream fos = new FileOutputStream("/home/user/Pictures/8mbsample_scaled.jpg");
    fos.write(sof); fos.close();

    System.out.println("Process took: " + (end-start) + "ms");

Output:

Process took: 783ms